Cream softened butter and salt together until well blended in a large bowl.
Stir in sweetened condensed milk. Add powdered sugar, mix as well as you can , turn out of bowl onto surface you have dusted with powdered sugar.
Add peppermint oil and knead until dough is smooth.
Divide into 4 pieces, roll each piece into a rope, cutting each rope into pieces with a sharp knife, one rope at a time.
Lay mints on lined pans as you cut them.
Let mellow and air dry for 1 or 2 days, turning once when they feel dry. Then they are ready to package or eat. Enjoy.
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